Apparatus for cutting and abrading



April 10, 1956 c. T. ASBURY 2,740,980

APPARATUS FOR CUTTING AND ABRADING Filed Feb. 25. 1953 Ilia/It'll!!! anal/u 1/1771 VIIIIIIIIIIII IIIIII 'lnnn INVENTOR.

22 CHARLES T. ASBURY BY f M ATTORNEYS U d Sees .P?Fn IO..

APPARATUS FOR CUTTING AND ABRADING Charles T. Asbury, Fort Lauderdale, Fla.

Application February 25, 1953, Serial No. 339,004

Claims. (Cl. -198) This invention relates to a cutting and abrading device, particularly to such a device in connection with the abrading and cutting of relatively hard substances, and in locations which are difiicult to deal with in the ordinary manner.

In the cutting or abrading of materials such as concrete considerable difiiculty has been experienced heretofore in constructing and maintaining in operation a cutter which is economical and which will operate satisfactorily under all circumstances. For example, the usual concrete cutter is in the form of a relatively expensive saw blade which must be supplied with lubricant continuously during operation and which is relatively slow in accomplishing its work. Such a blade, furthermore, does not have a particularly long life and must frequently be re-sharpened and very often breaks.

In connection with the general art of cutting concrete, it often occurs that it is desirable to abrade the concrete surface for roughening it to prevent skidding thereon or, conversely, to abrade a concrete surface to remove rough spots therefrom. A concrete cutter of the conventional type, namely, one in the form of a saw blade, is obviously unsuited for this purpose, and whereby heretofore this sort of work has largely been done manually with a great expenditure of time and effort.

Having the foregoing in mind, it is a primary object of the present invention to provide a tool particularly adapted for the cutting or abrading of materials such as concrete.

Another particular object of this invention is the provision of a tool for treating materials such as concrete and the like which has improved operating characteristics, is relatively inexpensive, and has long life.

A still further object of this invention is the provision of a cutting or abrading tool of the nature referred to having a general utility in that it can be employed for cutting and abrading operations on a great number'of different materials.

These and other objects and advantages of this invention will appear more clearly in the following specification in connection with the accompanying drawings, in which:

Figure l is an elevational view of a cutting or abrading tool according to my invention;

Figure 2 is a fragmentary perspective view showing the parts of the holder for the tool in disassembled relation; and

Figure 3 is a fragmentary view showing a modified arrangement of the cutting elements that form a part of the cutting and abrading member.

Referring to the drawings somewhat more in detail, a cutting and abrading tool according to the present invention comprises a circular support plate 10' having means, such as a central aperture 12, for drivingly mounting and supporting it on a rotary drive member such as a shaft.

Arranged in circumferentially spaced relation on one side. of the plate about the periphery thereof are the 2,740,980 Patented Apr. 10, 1 956 holders 14, the exact construction of which will be more clearly seen in Figure 2. The holders 14 are generally triangular in shape while having curved outer parts that register with the periphery of plate 10, and there are also provided on their inner faces two notches 16 that intersect toward the apex of the plate and which define a generally V-shaped slot for receiving the-cutting elements.

The cutting elements mounted in the holder, consisting of plate 10 and the blocks 14, comprise a plurality of individual twisted wire elements 18. These elements are formed of relatively heavy wire, on the order of of an inch in diameter and upwardly, and are closely twisted together. Each block or holder 14 receives a plurality of the cutting elements 18 in nested relation so that the cutting elements generally are relatively thin in the axial direction of the plate 10, but extend a substantial distance circumferentially thereof. The twisting of the individual wires together in groups of two or more to form the individual elements 18 causes the wires to support each other while the close twist of the wires together prevents spreading thereof at the ends and adds resilience and stiffness to the individual elements.

The nested groups of individual elements form the cutting elements, but by being arranged in this manner support and reinforce one another while at the same time remaining yieldable so as to conform the slight irregularities in the surface being worked while developing ample force to carry out the most severe cutting operations.

In assembling the blocks or holders 14 together with the cutting elements on plate 10, cap screws 20 are provided that extend through the blocks or holders 14 and threadedly engage plate 10. A dowel pin 22 is also provided extending from plate 10 through a suitable hole at the apex of each block or holder 14. The pins 22 assist in locating the blocks or holders 14, transmit torque between plate 10 and blocks or holders 14, and also prevent the cutting elements from being pushed inwardly toward the center of plate 10 during operation of the cutting and abrading tool.

An important feature of my invention is the simplicity of construction of the cutting tool so that it can be constructed economically and readily repaired at any time, as by replacing some or all of the cutting elements.

A still further important feature is that while a relatively thin plate 10 can be employed, the combination of the mass of plate 10 with the mass of the blocks or holders 14 and the cutting elements held thereby is such that a flywheel action is had that is substantially greater than would be obtained by any conventional saw-type cutter designed for accomplishing a similar cutting action.

A still further important feature of my invention resides in the location of the blocks or holders 14 in circum ferentially spaced relation so that a general action is had which drives air toward the work being treated which serves to blow dust and dislodged particles away from the area being worked as well as supplying cooling medium to the working area. The blocks or holders 14, on being opened at their apices, also permit a supply of the centrifugally driven air therethrough and around the cutting elements held thereby thus to promote eflicient cooling thereof when the tool is in operation.

This same constructural feature also permits a ready supply of liquid lubricant and coolant to the working space and through the blocks or holders 14 along the cutting elements under circumstances where it might be desirable or necessary to supply such a liquid medium.

I have found the cutting and abrading tool, according to my invention, to be particularly effective, as mentioned before, inthe cutting and abrading of-concrete, and also for scoring concrete panels or for cleaning expansion joints between concrete panels, for the abrading of weldments to remove scale therefrom, for the cutting and abrading of many other materials such as rubber, plastics and castings, and useful in removing rust and hard corrosion, in de-barking trees, in cutting asphalt and similar materials, and in working ground such as in grass edging.

It will be understood that this invention is susceptible to modification in order to adapt it to different usages and conditions, and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.

What I claim is:

1. In an abrading and cutting tool of the nature described; a plate serving as a holder, a plurality of sectorsh'aped blocks mounted on the plate adjacent the periphery thereof, said plate and blocks defining therebetween generally V-shaped grooves with the legs extending substantially radially of the plate, and generally V-shaped twisted wire pairs in said grooves having their ends extending outwardly from the periphery of said plate and means detachably securing the blocks to the plate.

2. In an abrading and cutting tool of the nature described; a plate serving as a holder, a plurality of blocks mounted on the plate adjacent the periphery thereof, each block having a pair of grooves in the plate side thereof extending substantially radially of the plate, and generally V-shaped cutting elements comprising twisted wire pairs in said grooves having their ends extending radially outwardly from the periphery of the plate,

3. In an abrading and cutting tool of the nature described; a plate serving as a holder, a plurality of blocks mounted on the plate adjacent the periphery thereof, each block having a pair of grooves in the plate side thereof extending substantially radially of the plate, and generally V-shaped cutting elements comprising twisted wire pairs in said grooves having their ends extending radially outwardly from the periphery of the plate, each cutting element comprising a plurality of the said twisted wire pairs arranged in nesting relation.

4. In an abrading and cutting tool of the nature described; a circular plate, a plurality of blocks mounted on one side of the plate at the periphery thereof in uniformly spaced relation, each block having a pair of grooves in the plate side thereof substantially radial of the plate that intersect toward the center of the plate, a cutting element in each said pair of grooves, each element comprising a plurality of twisted wire pairs in co-planar nesting relation bent to a V shape and having their legs projecting radially beyond the periphery of the plate.

5. In an abrading and cutting tool of the nature described; a circular plate, a plurality of blocks mounted on one side of the plate at the periphery thereof in uniformly spaced relation, each block having a pair of grooves in the plate side thereof substantially radial of the plate that intersect toward the center of the plate, a cutting element in each said pair of grooves, each element comprising a plurality of twisted wire pairs in co-planar nesting relation bent to a V shape and having their legs projecting radially beyond the periphery of the plate, the region of intersection of said grooves being open toward the center of the plate whereby a fan action obtains when the plate is rotated that will drive air through the grooves to cool and clean said elements.

6. In an abrading and cutting tool of the nature described; a circular plate having means at the center for supporting and driving it, a plurality of blocks on one side of the plate at the periphery thereof in spaced relation, each block being generally triangular with its apex toward the center of the plate, each block having a pair of grooves in its plate side substantially radial of the plate and intersecting in the region of the apex of the pertaining block, a generally V-shaped cutting element in each said pair of grooves having the ends of its legs extending outwardly from the periphery of the plate, each element comprising a plurality of twisted wire pairs in nesting relation, means clamping the blocks to the plate, and a dowel pin connecting each block at the said apex thereof with the plate serving to locate the blocks on the plate and also preventing movement of the cutting elements inwardly of the plate.

7. In an abrading and cutting tool of the nature described; a circular plate having means at the center for supporting and driving it, a plurality of blocks on one side of the plate at the periphery thereof in spaced relation, each block being generally triangular with its apex toward the center of the plate, each block having a pair of grooves in its plate side substantially radial of the plate and intersecting in the region of the apex of the pertaining block, a generally V-shaped cutting element in each said pair of grooves having the ends of its legs extending outwardly from the periphery of the plate, each element comprising a plurality of twisted wire pairs in nesting relation, means clamping the blocks to the plate, and a dowel pin connecting each block at the said apex thereof with the plate serving to locate the blocks on the plate and also preventing movement of the cutting elements inwardly of the plate, the ends of the legs of twisted wire pairs in each side of each element being progressively shorter in the direction of rotation of the plate.

8. In an abrading and cutting tool of the nature described; a circular plate having means at the center for supporting and driving it, a plurality of blocks on one side of the plate at the periphery thereof in spaced relation, each block being generally triangular with its apex toward the center of the plate, each block having a pair of grooves in its plate side substantially radial of the plate and intersecting in the region of the apex of the pertaining block, a generally V-shaped cutting element in each said pair of grooves having the ends of its legs extending outwardly from the periphery of the plate, each element comprising a plurality of twisted wire pairs in nesting relation, means clamping the blocks to the plate, and a dowel pin connecting each block at the said apex thereof with the plate serving to locate the blocks on the plate and also preventing movement of the cutting elements inwardly of the plate, each twisted wire pair consisting of a pair of wires of about in diameter twisted closely together.

9. A cutting device comprising a series of circumferentially spaced cutting elements, each cutting element comprising a pair of tightly twisted wires formed into substantially a V, the apices of said V-shaped cutting elements being directed to a common center, said wires being of a size so that the cutting elements are semi-rigid and are prevented from spreading at the ends of their legs, and means supporting said cutting elements in the region of the apices thereof and for a substantial distance along the legs thereof while leaving the outer ends of the legs thereof exposed for engagement with the work.

10. An arrangement according to claim 9 in which each cutting element consists of a plurality of said tightly twisted wire pairs in nested relation with the legs thereof in parallel co-planar contiguous relation.

References Cited in the file of this patent UNITED STATES PATENTS 285,222 Brunelle Sept. 18, 1883 822,873 Thurston June 5, 1906 826,628 Thurston July 24, 1906 1,386,880 Lorenz Aug. 9, 1921 1,480,542 Brown Jan. 15, 1924 1,493,670 Galvin May 13, 1924 1,517,852 Neff Dec. 2, 1924 1,610,419 Brown Dec. 14, 1926 1,970,302 Gerhardt Aug. 14, 1934 2,023,275 Long Dec. 3, 1935 2,062,047 Bickel et al Nov. 24, 1936 2,480,877 Peterson Sept. 6, 1949 

